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Import Libraries

library(aplore3)
library(caret)
library(dplyr)
library(tidyverse)
library(car)
require(ggthemes)
library(glmnet)
library(cowplot)
library(ROCR)
library(GGally)
library(ResourceSelection)

#Import Data

data = glow_bonemed 
data = data.frame(data)
dim(data)
[1] 500  18

#Split train and test set

set.seed(66)
trainIndex <- createDataPartition(data$fracture, p = .8, 
                                  list = FALSE, 
                                  times = 1)
train <- data[trainIndex,]
test  <- data[-trainIndex,]
dim(train)
[1] 400  18
dim(test)
[1] 100  18

Objective do EDA and Simple Model

EDA

All of the EDA will be done in the train data

View head of dataframe

head(train)

Looking at Fracture balance

# look for class imbalance
# The dataset is hevaily imbalance with more No's than Yes

data_classes = data %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
train_classes = train %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
test_classes = test %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()

plot_grid(data_classes, train_classes, test_classes, labels = c("Overall Data", "Train Data", "Test Data"))

Let’s look at pair plots from all the numeric variables

train_numeric = train %>% select_if(is.numeric)
pairs(train[,2:8],col=as.factor(train$fracture))

Looking at a different view of pair plots for numerical variables. Excluding id’s

ggpairs(train,columns=4:8,aes(colour=fracture))

Looking at box plot for different numerical variables per fracture or not

boxplot_age = train %>% ggplot(aes(y=age, x=fracture)) + geom_boxplot() + ggtitle("age vs fracture") + theme_fivethirtyeight()

boxplot_weight = train %>% ggplot(aes(y=weight, x=fracture)) + geom_boxplot() + ggtitle("weight vs fracture")  + theme_fivethirtyeight()

boxplot_height = train %>% ggplot(aes(y=height, x=fracture)) + geom_boxplot() + ggtitle("height vs fracture") + theme_fivethirtyeight()

boxplot_bmi= train %>% ggplot(aes(y=bmi, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

boxplot_fracscore= train %>% ggplot(aes(y=fracscore, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

plot_grid(boxplot_age, boxplot_weight, boxplot_height, boxplot_bmi, boxplot_fracscore, nrow=2, ncol=2)

Lets look at bmi vs age per different categorical variables

# relation of bmi and age

age_bim_fracture = train %>% ggplot(aes(x=age, y=bmi, col=fracture)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_premeno = train %>% ggplot(aes(x=age, y=bmi, col=premeno)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_smoke = train %>% ggplot(aes(x=age, y=bmi, col=raterisk)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_raterisk = train %>% ggplot(aes(x=age, y=bmi, col=smoke)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

plot_grid(age_bim_fracture, age_bim_premeno,age_bim_smoke, age_bim_raterisk, nrow=4, ncol=1)

Lets look at different numerica variables vs categorical variables per site id The point os to investigate if site id had any impact

bmi_frac_type = train %>% ggplot(aes(x=fracture, y=bmi, col=as.factor(site_id))) + geom_boxplot() + ggtitle("BMI for fracture type per site id")

age_frac_type = train %>% ggplot(aes(x=fracture, y=age, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Age for fracture type per site id")

weight_frac_type = train %>% ggplot(aes(x=fracture, y=weight, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Weight for fracture type per site id")

height_frac_type = train %>% ggplot(aes(x=fracture, y=height, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Height for fracture type per site id")

plot_grid(bmi_frac_type, age_frac_type, weight_frac_type,height_frac_type, nrow=2, ncol=2)

Build a new model

Lets train an interpretable logistic regression using the lasso technique The point of this model is to be interpretable, meaning no exotic variables such as iteraction terms


## removed sub_id site_id phy_id
train.x <- model.matrix(fracture~ site_id + phy_id + priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu + bonetreat, train)

train.y<-train[,15]


nFolds = 10 
set.seed(3)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-3, 5, length.out = 2000)
set.seed(3)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                   type.measure = "class", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid)

plot(cvfit)


coef(cvfit, s = "lambda.min")
19 x 1 sparse Matrix of class "dgCMatrix"
                          1
(Intercept)      3.14581196
(Intercept)      .         
site_id          0.04744940
phy_id           .         
priorfracYes     0.27244168
age              .         
weight           .         
height          -0.04162330
bmi              0.03343667
premenoYes       0.43710027
momfracYes       0.63341776
armassistYes     .         
smokeYes        -0.62861341
rateriskSame     0.19988267
rateriskGreater  0.39124916
fracscore        0.17335813
bonemedYes       0.93958310
bonemed_fuYes    1.23851632
bonetreatYes    -1.63890916
print("CV Error Rate:")
[1] "CV Error Rate:"
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]
[1] 0.24
#Optimal penalty
print("Penalty Value:")
[1] "Penalty Value:"
cvfit$lambda.min
[1] 0.003469526

build a final interpretable model based on feature selection and lambda value selected above

#For final model predictions go ahead and refit lasso using entire
#data set
#finalmodel = glmnet(train.x, train.y, family = "binomial",lambda=cvfit$lambda.min)
finalmodel<-glm(fracture ~ site_id + priorfrac + height + bmi + premeno + momfrac + 
                  smoke + raterisk + raterisk + fracscore + bonemed +
                  bonemed_fu + bonetreat
                  , data=train,family = binomial(link="logit"))
coef(finalmodel)
    (Intercept)         site_id    priorfracYes          height             bmi      premenoYes      momfracYes 
     3.74939105      0.05389650      0.30869979     -0.04715192      0.03726393      0.51497418      0.72431857 
       smokeYes    rateriskSame rateriskGreater       fracscore      bonemedYes   bonemed_fuYes    bonetreatYes 
    -0.72391421      0.28238740      0.47088398      0.17672553      1.77392450      1.57985379     -2.81457532 
confint(finalmodel)
Waiting for profiling to be done...
                       2.5 %       97.5 %
(Intercept)     -3.171720694 10.846686131
site_id         -0.083143760  0.191472608
priorfracYes    -0.308857865  0.919463140
height          -0.089846240 -0.006160707
bmi             -0.006023961  0.080555865
premenoYes      -0.116772035  1.131952986
momfracYes       0.010995312  1.422843336
smokeYes        -2.035932212  0.349436980
rateriskSame    -0.356038631  0.933732303
rateriskGreater -0.208169120  1.159624762
fracscore        0.056654052  0.299272430
bonemedYes       0.135972387  3.503486123
bonemed_fuYes    0.515414220  2.699537279
bonetreatYes    -4.859074904 -0.855499389
summary(finalmodel)

Call:
glm(formula = fracture ~ site_id + priorfrac + height + bmi + 
    premeno + momfrac + smoke + raterisk + raterisk + fracscore + 
    bonemed + bonemed_fu + bonetreat, family = binomial(link = "logit"), 
    data = train)

Deviance Residuals: 
     Min        1Q    Median        3Q       Max  
-1.77345  -0.72697  -0.50850  -0.00233   2.31716  

Coefficients:
                Estimate Std. Error z value Pr(>|z|)   
(Intercept)      3.74939    3.56438   1.052  0.29284   
site_id          0.05390    0.06988   0.771  0.44056   
priorfracYes     0.30870    0.31252   0.988  0.32326   
height          -0.04715    0.02128  -2.216  0.02669 * 
bmi              0.03726    0.02200   1.694  0.09032 . 
premenoYes       0.51497    0.31724   1.623  0.10453   
momfracYes       0.72432    0.35861   2.020  0.04340 * 
smokeYes        -0.72391    0.59531  -1.216  0.22398   
rateriskSame     0.28239    0.32773   0.862  0.38888   
rateriskGreater  0.47088    0.34763   1.355  0.17556   
fracscore        0.17673    0.06171   2.864  0.00418 **
bonemedYes       1.77392    0.82928   2.139  0.03243 * 
bonemed_fuYes    1.57985    0.55009   2.872  0.00408 **
bonetreatYes    -2.81458    1.00298  -2.806  0.00501 **
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 449.87  on 399  degrees of freedom
Residual deviance: 387.07  on 386  degrees of freedom
AIC: 415.07

Number of Fisher Scoring iterations: 4
(vif(finalmodel)[,3])^2
   site_id  priorfrac     height        bmi    premeno    momfrac      smoke   raterisk  fracscore    bonemed bonemed_fu 
  1.041489   1.401640   1.092756   1.143599   1.088569   1.096608   1.044703   1.094237   1.456164   9.400026   4.361302 
 bonetreat 
 13.145499 
vif(finalmodel)
                GVIF Df GVIF^(1/(2*Df))
site_id     1.041489  1        1.020534
priorfrac   1.401640  1        1.183909
height      1.092756  1        1.045350
bmi         1.143599  1        1.069392
premeno     1.088569  1        1.043345
momfrac     1.096608  1        1.047191
smoke       1.044703  1        1.022107
raterisk    1.197355  2        1.046058
fracscore   1.456164  1        1.206716
bonemed     9.400026  1        3.065946
bonemed_fu  4.361302  1        2.088373
bonetreat  13.145499  1        3.625672
plot(finalmodel)

lets look at predictions for the lasso model also looking at the roc plot to select the most optimal threhold for classification

## removed sub_id 
test.x = model.matrix(fracture~site_id+phy_id+priorfrac+age+weight+height+bmi+premeno+momfrac+armassist+ smoke+raterisk + fracscore +bonemed+bonemed_fu+bonetreat, test)

fit.pred.lasso = predict(finalmodel, newdata = test, type = "response")
hoslem.test(finalmodel$y, fitted(finalmodel), g=10)

    Hosmer and Lemeshow goodness of fit (GOF) test

data:  finalmodel$y, fitted(finalmodel)
X-squared = 2.2327, df = 8, p-value = 0.973

There is a large p-value so the test is a fit

results.lasso = prediction(fit.pred.lasso, test$fracture, 
                           label.ordering=c("No","Yes"))
roc.lasso = performance(results.lasso, measure = "tpr", x.measure = "fpr")
plot(roc.lasso,colorize = TRUE)
abline(a=0, b= 1)

lets look at model performance metrics

cutoff<-0.3
class.lasso<-factor(ifelse(fit.pred.lasso>cutoff,"Yes","No"),levels=c("No","Yes"))


#Confusion Matrix for Lasso
conf.lasso<-table(class.lasso,test$fracture)
print("Confusion matrix for LASSO")
[1] "Confusion matrix for LASSO"
conf.lasso
           
class.lasso No Yes
        No  55  13
        Yes 20  12
precision <- posPredValue(class.lasso, test$fracture, positive="Yes")
recall <- sensitivity(class.lasso, test$fracture, positive="Yes")
F1 <- (2 * precision * recall) / (precision + recall)
print("accuracy")
[1] "accuracy"
mean(class.lasso==test$fracture)
[1] 0.67
print("precision")
[1] "precision"
precision
[1] 0.375
print("recall")
[1] "recall"
recall
[1] 0.48
print("F1")
[1] "F1"
F1
[1] 0.4210526

Stepwise regression

library(leaps)
nvmax = 17
reg_sq=regsubsets(fracture~.-sub_id,data=train, method="seqrep", nvmax=nvmax)
par(mfrow=c(2,2))
cp<-summary(reg_sq)$cp
plot(1:(nvmax),cp,type="l",ylab="CP",xlab="# of predictors")
index<-which(cp==min(cp))
points(index,cp[index],col="red",pch=10)
bics<-summary(reg_sq)$bic
plot(1:(nvmax),bics,type="l",ylab="BIC",xlab="# of predictors")
index<-which(bics==-0.05839447)
points(index,bics[index],col="red",pch=10)
adjr2<-summary(reg_sq)$adjr2
plot(1:(nvmax),adjr2,type="l",ylab="Adjusted R-squared",xlab="# of predictors")
index<-which(adjr2==max(adjr2))
points(index,adjr2[index],col="red",pch=10)
rss<-summary(reg_sq)$rss
plot(1:(nvmax),rss,type="l",ylab="train RSS",xlab="# of predictors")
index<-which(rss==min(rss))
points(index,rss[index],col="red",pch=10)


cbind(CP=summary(reg_sq)$cp,
      r2=summary(reg_sq)$rsq,
      Adj_r2=summary(reg_sq)$adjr2,
      BIC=summary(reg_sq)$bic,
      RSS = summary(reg_sq)$rss)
             CP         r2     Adj_r2          BIC      RSS
 [1,] 29.896467 0.06228673 0.05993067 -13.74149469 70.32850
 [2,] 21.262665 0.08569960 0.08109355 -17.86404376 68.57253
 [3,] 17.163256 0.09912891 0.09230413 -17.79138417 67.56533
 [4,] 14.815639 0.10870123 0.09967542 -16.07291365 66.84741
 [5,] 12.346001 0.11854221 0.10735620 -14.52247919 66.10933
 [6,]  9.401752 0.12942816 0.11613699 -13.50174767 65.29289
 [7,]  6.574529 0.14005645 0.12470032 -12.42369709 64.49577
 [8,]  6.456459 0.14471989 0.12722056  -8.60732019 64.14601
 [9,]  6.605170 0.14879595 0.12915278  -4.52671474 63.84030
[10,]  7.135831 0.15203105 0.13023236  -0.05839447 63.59767
[11,]  7.863885 0.15483155 0.13087058   4.60984770 63.38763
[12,]  9.203207 0.15628619 0.13012452   9.91226888 63.27854
[13,] 26.199933 0.12326730 0.09374003  31.25925645 65.75495
[14,] 28.025380 0.12365162 0.09178440  37.07534104 65.72613
[15,] 14.011020 0.15891107 0.12605604  26.64027837 63.08167
[16,] 26.238505 0.13639281 0.10031522  43.19999545 64.77054
[17,] 18.000000 0.15893534 0.12150576  38.61166880 63.07985
coef(reg_sq, 10)
  (Intercept)  priorfracYes        weight           bmi    premenoYes    momfracYes      smokeYes     fracscore    bonemedYes 
  0.896192259   0.074990114  -0.009135076   0.029519214   0.078337622   0.147229030  -0.100225591   0.027287755   0.372353460 
bonemed_fuYes  bonetreatYes 
  0.356825487  -0.614896361 
#To deal with the redundamcy, I would throw the cylinder variable out and then see what happens
model.main<-glm(fracture ~priorfrac+weight+bmi+premeno+momfrac+smoke+fracscore+bonemed+bonemed_fu+bonetreat, data=train,family = binomial(link="logit"))
summary(model.main)

Call:
glm(formula = fracture ~ priorfrac + weight + bmi + premeno + 
    momfrac + smoke + fracscore + bonemed + bonemed_fu + bonetreat, 
    family = binomial(link = "logit"), data = train)

Deviance Residuals: 
     Min        1Q    Median        3Q       Max  
-1.68327  -0.74758  -0.51429  -0.00849   2.32662  

Coefficients:
              Estimate Std. Error z value Pr(>|z|)    
(Intercept)   -3.42910    0.73446  -4.669 3.03e-06 ***
priorfracYes   0.37714    0.30346   1.243  0.21394    
weight        -0.05476    0.02293  -2.388  0.01695 *  
bmi            0.17836    0.06172   2.890  0.00385 ** 
premenoYes     0.53354    0.31491   1.694  0.09022 .  
momfracYes     0.81220    0.35193   2.308  0.02101 *  
smokeYes      -0.69295    0.59151  -1.171  0.24140    
fracscore      0.17217    0.06114   2.816  0.00487 ** 
bonemedYes     1.87128    0.83048   2.253  0.02424 *  
bonemed_fuYes  1.73253    0.53628   3.231  0.00124 ** 
bonetreatYes  -2.93248    1.00520  -2.917  0.00353 ** 
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

(Dispersion parameter for binomial family taken to be 1)

    Null deviance: 449.87  on 399  degrees of freedom
Residual deviance: 388.89  on 389  degrees of freedom
AIC: 410.89

Number of Fisher Scoring iterations: 4
exp(cbind("Odds ratio" = coef(model.main), confint.default(model.main, level = 0.95)))
              Odds ratio       2.5 %     97.5 %
(Intercept)   0.03241615 0.007684079  0.1367511
priorfracYes  1.45811288 0.804427013  2.6429908
weight        0.94671625 0.905106185  0.9902392
bmi           1.19525393 1.059076423  1.3489413
premenoYes    1.70495430 0.919722940  3.1605922
momfracYes    2.25286510 1.130235590  4.4905692
smokeYes      0.50010048 0.156877764  1.5942380
fracscore     1.18787740 1.053723165  1.3391114
bonemedYes    6.49663181 1.275805335 33.0820257
bonemed_fuYes 5.65495838 1.976724475 16.1775476
bonetreatYes  0.05326457 0.007426895  0.3820054
vif(model.main)
 priorfrac     weight        bmi    premeno    momfrac      smoke  fracscore    bonemed bonemed_fu  bonetreat 
  1.330137   9.180248   8.988158   1.075832   1.064687   1.038839   1.426069   9.429683   4.153687  13.202319 
#Residual diagnostics can be obtained using
plot(model.main)

NA

fit.pred.step = predict(model.main, newdata = test, type = "response")
results.step = prediction(fit.pred.step, test$fracture, 
                           label.ordering=c("No","Yes"))
roc.step = performance(results.step, measure = "tpr", x.measure = "fpr")
plot(roc.step, colorize = TRUE)
abline(a=0, b= 1)

lets look at model performance metrics

cutoff<-0.3
class.step<-factor(ifelse(fit.pred.step>cutoff,"Yes","No"),levels=c("No","Yes"))


#Confusion Matrix for Lasso
conf.step<-table(class.step,test$fracture)
print("Confusion matrix for LASSO")
[1] "Confusion matrix for LASSO"
conf.step
          
class.step No Yes
       No  57  14
       Yes 18  11
precision <- posPredValue(class.step, test$fracture, positive="Yes")
recall <- sensitivity(class.step, test$fracture, positive="Yes")
F1 <- (2 * precision * recall) / (precision + recall)
print("accuracy")
[1] "accuracy"
mean(class.step==test$fracture)
[1] 0.68
print("precision")
[1] "precision"
precision
[1] 0.3793103
print("recall")
[1] "recall"
recall
[1] 0.44
print("F1")
[1] "F1"
F1
[1] 0.4074074
---
title: "R Notebook"
output: html_notebook
---

This is an [R Markdown](http://rmarkdown.rstudio.com) Notebook. When you execute code within the notebook, the results appear beneath the code. 

Try executing this chunk by clicking the *Run* button within the chunk or by placing your cursor inside it and pressing *Cmd+Shift+Enter*. 

Import Libraries
```{r message=FALSE, warning=FALSE}
library(aplore3)
library(caret)
library(dplyr)
library(tidyverse)
library(car)
require(ggthemes)
library(glmnet)
library(cowplot)
library(ROCR)
library(GGally)
library(ResourceSelection)
```

#Import Data
```{r}
data = glow_bonemed 
data = data.frame(data)
dim(data)
```

#Split train and test set
```{r}
set.seed(66)
trainIndex <- createDataPartition(data$fracture, p = .8, 
                                  list = FALSE, 
                                  times = 1)
train <- data[trainIndex,]
test  <- data[-trainIndex,]
dim(train)
dim(test)
```

# Objective do EDA and Simple Model
# EDA


All of the EDA will be done in the train data

View head of dataframe
```{r}
head(train)
```
Looking at Fracture balance
```{r}
# look for class imbalance
# The dataset is hevaily imbalance with more No's than Yes

data_classes = data %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
train_classes = train %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()
test_classes = test %>% ggplot(aes(x=fracture)) + geom_bar() + theme_fivethirtyeight()

plot_grid(data_classes, train_classes, test_classes, labels = c("Overall Data", "Train Data", "Test Data"))

```


Let's look at pair plots from all the numeric variables
```{r}
train_numeric = train %>% select_if(is.numeric)
pairs(train[,2:8],col=as.factor(train$fracture))
```
Looking at a different view of pair plots for numerical variables. Excluding id's  
```{r message=FALSE, warning=FALSE}
ggpairs(train,columns=4:8,aes(colour=fracture))
```
Looking at box plot for different numerical variables per fracture or not
```{r}
boxplot_age = train %>% ggplot(aes(y=age, x=fracture)) + geom_boxplot() + ggtitle("age vs fracture") + theme_fivethirtyeight()

boxplot_weight = train %>% ggplot(aes(y=weight, x=fracture)) + geom_boxplot() + ggtitle("weight vs fracture")  + theme_fivethirtyeight()

boxplot_height = train %>% ggplot(aes(y=height, x=fracture)) + geom_boxplot() + ggtitle("height vs fracture") + theme_fivethirtyeight()

boxplot_bmi= train %>% ggplot(aes(y=bmi, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

boxplot_fracscore= train %>% ggplot(aes(y=fracscore, x=fracture)) + geom_boxplot() + ggtitle("bmi vs fracture")  + theme_fivethirtyeight()

plot_grid(boxplot_age, boxplot_weight, boxplot_height, boxplot_bmi, boxplot_fracscore, nrow=2, ncol=2)
```
Lets look at bmi vs age per different categorical variables
```{r fig.height=10, fig.width=5}
# relation of bmi and age

age_bim_fracture = train %>% ggplot(aes(x=age, y=bmi, col=fracture)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_premeno = train %>% ggplot(aes(x=age, y=bmi, col=premeno)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_smoke = train %>% ggplot(aes(x=age, y=bmi, col=raterisk)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

age_bim_raterisk = train %>% ggplot(aes(x=age, y=bmi, col=smoke)) + geom_point() + geom_smooth(method = 'loess' , formula = 'y ~ x'
) + ggtitle("bmi vs age") + xlab("age") + ylab("bmi") + theme_minimal() 

plot_grid(age_bim_fracture, age_bim_premeno,age_bim_smoke, age_bim_raterisk, nrow=4, ncol=1)

```

Lets look at different numerica variables vs categorical variables per site id
The point os to investigate if site id had any impact
```{r fig.height=5, fig.width=5, message=FALSE, warning=FALSE}
bmi_frac_type = train %>% ggplot(aes(x=fracture, y=bmi, col=as.factor(site_id))) + geom_boxplot() + ggtitle("BMI for fracture type per site id")

age_frac_type = train %>% ggplot(aes(x=fracture, y=age, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Age for fracture type per site id")

weight_frac_type = train %>% ggplot(aes(x=fracture, y=weight, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Weight for fracture type per site id")

height_frac_type = train %>% ggplot(aes(x=fracture, y=height, col=as.factor(site_id))) + geom_boxplot() + ggtitle("Height for fracture type per site id")

plot_grid(bmi_frac_type, age_frac_type, weight_frac_type,height_frac_type, nrow=2, ncol=2)
```

# Build a new model

Lets train an interpretable logistic regression using the lasso technique
The point of this model is to be interpretable, meaning no exotic variables such as iteraction terms

```{r}

## removed sub_id site_id phy_id
train.x <- model.matrix(fracture~ site_id + phy_id + priorfrac + age + weight + height + bmi + premeno + momfrac + armassist + smoke+ raterisk + fracscore + bonemed + bonemed_fu + bonetreat, train)

train.y<-train[,15]


nFolds = 10 
set.seed(3)
foldid  = sample(rep(seq(nFolds), length.out = nrow(train.x)))
lambdas_to_try <- 10^seq(-3, 5, length.out = 2000)
set.seed(3)               
cvfit = cv.glmnet(train.x, train.y, 
                   family = "binomial", 
                   type.measure = "class", 
                   lambda = lambdas_to_try, 
                   nfolds = nFolds, 
                   foldid = foldid)

plot(cvfit)

coef(cvfit, s = "lambda.min")

print("CV Error Rate:")
cvfit$cvm[which(cvfit$lambda==cvfit$lambda.min)]

#Optimal penalty
print("Penalty Value:")
cvfit$lambda.min
```

build a final interpretable model based on feature selection and lambda value selected above
```{r}
#For final model predictions go ahead and refit lasso using entire
#data set
#finalmodel = glmnet(train.x, train.y, family = "binomial",lambda=cvfit$lambda.min)
finalmodel<-glm(fracture ~ site_id + priorfrac + height + bmi + premeno + momfrac + 
                  smoke + raterisk + raterisk + fracscore + bonemed +
                  bonemed_fu + bonetreat
                  , data=train,family = binomial(link="logit"))
coef(finalmodel)
confint(finalmodel)
summary(finalmodel)
```
```{r}
(vif(finalmodel)[,3])^2
vif(finalmodel)
```


```{r}
plot(finalmodel)
```


lets look at predictions for the lasso model
also looking at the roc plot to select the most optimal threhold for classification
```{r}
## removed sub_id 
test.x = model.matrix(fracture~site_id+phy_id+priorfrac+age+weight+height+bmi+premeno+momfrac+armassist+ smoke+raterisk + fracscore +bonemed+bonemed_fu+bonetreat, test)

fit.pred.lasso = predict(finalmodel, newdata = test, type = "response")
```

```{r}
hoslem.test(finalmodel$y, fitted(finalmodel), g=10)
```

There is a large p-value so the test is a fit

```{r}
results.lasso = prediction(fit.pred.lasso, test$fracture, 
                           label.ordering=c("No","Yes"))


```


```{r}
roc.lasso = performance(results.lasso, measure = "tpr", x.measure = "fpr")
plot(roc.lasso,colorize = TRUE)
abline(a=0, b= 1)
```



lets look at model performance metrics
```{r}
cutoff<-0.3
class.lasso<-factor(ifelse(fit.pred.lasso>cutoff,"Yes","No"),levels=c("No","Yes"))


#Confusion Matrix for Lasso
conf.lasso<-table(class.lasso,test$fracture)
print("Confusion matrix for LASSO")
conf.lasso
precision <- posPredValue(class.lasso, test$fracture, positive="Yes")
recall <- sensitivity(class.lasso, test$fracture, positive="Yes")
F1 <- (2 * precision * recall) / (precision + recall)
print("accuracy")
mean(class.lasso==test$fracture)
print("precision")
precision
print("recall")
recall
print("F1")
F1
```

# Stepwise regression

```{r}
library(leaps)
nvmax = 17
reg_sq=regsubsets(fracture~.-sub_id,data=train, method="seqrep", nvmax=nvmax)
```

```{r}
par(mfrow=c(2,2))
cp<-summary(reg_sq)$cp
plot(1:(nvmax),cp,type="l",ylab="CP",xlab="# of predictors")
index<-which(cp==min(cp))
points(index,cp[index],col="red",pch=10)
bics<-summary(reg_sq)$bic
plot(1:(nvmax),bics,type="l",ylab="BIC",xlab="# of predictors")
index<-which(bics==-0.05839447)
points(index,bics[index],col="red",pch=10)
adjr2<-summary(reg_sq)$adjr2
plot(1:(nvmax),adjr2,type="l",ylab="Adjusted R-squared",xlab="# of predictors")
index<-which(adjr2==max(adjr2))
points(index,adjr2[index],col="red",pch=10)
rss<-summary(reg_sq)$rss
plot(1:(nvmax),rss,type="l",ylab="train RSS",xlab="# of predictors")
index<-which(rss==min(rss))
points(index,rss[index],col="red",pch=10)
```

```{r}

cbind(CP=summary(reg_sq)$cp,
      r2=summary(reg_sq)$rsq,
      Adj_r2=summary(reg_sq)$adjr2,
      BIC=summary(reg_sq)$bic,
      RSS = summary(reg_sq)$rss)
```


```{r}
coef(reg_sq, 10)
```




```{r}
#To deal with the redundamcy, I would throw the cylinder variable out and then see what happens
model.main<-glm(fracture ~priorfrac+weight+bmi+premeno+momfrac+smoke+fracscore+bonemed+bonemed_fu+bonetreat, data=train,family = binomial(link="logit"))
summary(model.main)
exp(cbind("Odds ratio" = coef(model.main), confint.default(model.main, level = 0.95)))
vif(model.main)
```

```{r}
#Residual diagnostics can be obtained using
plot(model.main)

```


```{r}
fit.pred.step = predict(model.main, newdata = test, type = "response")

```

```{r}
results.step = prediction(fit.pred.step, test$fracture, 
                           label.ordering=c("No","Yes"))


```


```{r}
roc.step = performance(results.step, measure = "tpr", x.measure = "fpr")
plot(roc.step, colorize = TRUE)
abline(a=0, b= 1)
```



lets look at model performance metrics
```{r}
cutoff<-0.3
class.step<-factor(ifelse(fit.pred.step>cutoff,"Yes","No"),levels=c("No","Yes"))


#Confusion Matrix for Lasso
conf.step<-table(class.step,test$fracture)
print("Confusion matrix for LASSO")
conf.step
precision <- posPredValue(class.step, test$fracture, positive="Yes")
recall <- sensitivity(class.step, test$fracture, positive="Yes")
F1 <- (2 * precision * recall) / (precision + recall)
print("accuracy")
mean(class.step==test$fracture)
print("precision")
precision
print("recall")
recall
print("F1")
F1
```
